The processing of concurrent sounds based on inharmonicity and asynchronous onsets: An object-related negativity (ORN) study
The processing of concurrent sounds based on inharmonicity and asynchronous onsets: An object-related negativity (ORN) study
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基于不和谐和异步开始的并发声音处理：一项与对象相关的消极性（ORN）研究
DOI：
10.1016/j.brainres.2011.12.044
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发表时间：
2012
期刊：
影响因子：
2.9
通讯作者：
Bendixen
中科院分区：
文献类型：
--
作者：
Schröger;Bendixen
本研究探讨了基于不和谐性和起始音线索的并发音的加工。我们使用的是谐波复合音，其中一个分量比复合音稍早（40 ms）或相当早（500 ms）开始，并且轻微（3%）或强烈（13%）不谐波。要索引同步事件的声音隔离，我们测量了事件相关电位的对象相关负性（ORN）组件。我们对比了两个假设：根据并行分离假说，假设增加的起始频率促进了前导分音从谐波复合体中的分离，这应该反映在增加的ORN振幅中。也就是说，即使有大的发病率，并发事件也会被同时健全的隔离机制处理。然而，根据序列整合假说，随着发病率的增加，假设并发线索被同时分组过程较少考虑，这应该反映在衰减的ORN振幅长发病率的神经元。这个假设是基于这样的概念，即由于顺序积分，在声音开始后的~ 350 ms内已经开发了对前导部分的稳定的感知，因此基于并发线索的场景分析机制需要较少的处理。事实上，随着发病率的增加，ORN被发现减少，这支持了顺序整合假说。与以前的数据一致，ORN也被发现随着不和谐性的增加而增加。不存在不和谐性×起始音的交互作用进一步支持了这一假设，即两种线索以不同的方式用于同时的声音分离。
This study addresses the processing of concurrent sounds based on inharmonicity and onset asynchrony cues. We used harmonic complex sounds with one component starting marginally (40ms) or considerably (500ms) earlier than the complex and being slightly (3%) or strongly (13%) inharmonic. To index sound segregation of concurrent events, we measured the object-related negativity (ORN) component of the event-related potential. We contrasted two hypotheses: According to the concurrent-segregation hypothesis, increased onset asynchrony is assumed to promote segregation of the leading partial from the harmonic complex, which should be reflected in increased ORN amplitudes. That is, even with large onset asynchronies concurrent events would be processed by a simultaneous sound segregation mechanism. According to the sequential-integration hypothesis, however, with increased onset asynchrony concurrent cues are assumed to be less considered by simultaneous grouping processes, which should be reflected in attenuated ORN amplitudes for long onset asynchronies. This assumption is based on the notion that due to sequential integration, a stable percept of the leading partial has been developed within ~350ms after sound onset, thus less processing is required from scene analysis mechanisms based on concurrent cues. Indeed, with increased onset asynchrony ORN was found to decrease, which supports the sequential-integration hypothesis. In line with previous data, ORN was also found to increase with increased inharmonicity. The absence of an inharmonicity×onset asynchrony interaction further supports the assumption that both cues are used in different ways for simultaneous sound segregation.
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影响因子：
2.4
作者：
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发表时间：
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期刊：
Brain research. Cognitive brain research
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